def create_app(test_config=None): # application factory
# create and instantiate an instance of Flask
# `instance_relative_config=True` signifies that the app instance configuration files are relative to the instance folder
# `test_config` is a key:value map required to signify testing nuances
app = Flask(__name__, instance_relative_config=True) # create instance
# initialize default configurations for the newly instantiated app
app.config.from_mapping(
SECRET_KEY=os.getenv("SECRET_KEY"), # secure random phrase used to sign session cookies et al.
DATABASE=os.path.join(app.instance_path, 'blogdatabase.sqlite') # define path for database upon autogeneration of the db
)
# Set the session
app.config['SESSION_TYPE'] = 'filesystem'
sess = Session()
sess.init_app(app)
# allows for alternative source of default configuration e.g. loading configuration from `config.py` [in the instance folder]
if test_config is None:
# load the instance config, if it exists when not testing
app.config.from_pyfile('config.py', silent=True)
else:
# load the test config if passed in
app.config.from_mapping(test_config)
# ensure the instance folder exists i.e. creates the instance folder [in case it does not exist]
try:
os.makedirs(app.instance_path)
except OSError:
pass
# a simple page that says hello (to show the app works) based on the url path `/hello`
@app.route('/hello')
def hello():
return 'Hello, World!'
# initialize the database, by calling `init_app()` from `db.py` : after initiliazing the app configs
db.init_app(app)
# initialize the registered auth blueprints, by calling `init_blueprint` from `auth.py` : after initializing the app database
auth.init_blueprint(app)
# initialize the registered blog blueprints, by calling `init_blueprint` from `blog.py` : after initializing the app database
blog.init_blueprint(app)
return app # return a properly configured instance of the app
# from app import app
# # app.run(debug=True)
from app import app
from flask_session.__init__ import Session
sess = Session()
if __name__ == "__main__":
app.secret_key = 'super secret key'
app.config['SESSION_TYPE'] = 'filesystem'
sess.init_app(app)
app.debug = True
app.run()